Module Creator Errors on Configure and Create Package

**Description of bug**
Trying to use the Module Creator 9.8.1 to make quick test module.

**Steps to reproduce**
1. Create Page
2. Place Module Creator Module on Page
3. Provide required information to create a module. (C#, User-Control)
4. Module is added to page.
5. Click module gear icon and select develop.
6. Click create package
7. Receive Error message - "A critical error has occurred. Please check the Admin Logs for further details."

**Current behavior**
Error Message

**Expected behavior**
Install Package is created

**Screenshots**

**Error information**
AbsoluteURL:/Default.aspx
DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID:57bfa4bf-fc12-48c4-930a-dfe681c2fbc2
AssemblyVersion:9.8.1
PortalId:0
UserId:1
TabId:1106
RawUrl:/Testing-Pages/User-Reg-Expired/ctl/ViewSource/ModuleId/1451/ctlid/303?ReturnURL=/Testing-Pages/User-Reg-Expired&popUp=true
Referrer:http://dnndev.me/Testing-Pages/User-Reg-Expired/ctl/ViewSource/ModuleId/1451/ctlid/303?ReturnURL=/Testing-Pages/User-Reg-Expired&popUp=true
UserAgent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36 Edg/88.0.705.68
ExceptionHash:eP6xokbN5rU4oR+vp4/9NDeAwbE=
Message:Object reference not set to an instance of an object.
StackTrace:
InnerMessage:Object reference not set to an instance of an object.
InnerStackTrace:
at Dnn.Module.ModuleCreator.ViewSource.OnPackageClick(Object sender, EventArgs e)
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.d__523.MoveNext()
Source:
FileName:
FileLineNumber:0
FileColumnNumber:0
Method:
Server Name: DESKTOP-ITGOR02

- [ ] 10.00.00 alpha build
- [ ] 09.09.00 release candidate
- [X] 09.08.01 latest supported release

- [ ] Chrome
- [ ] Firefox
- [ ] Safari
- [ ] Internet Explorer 11
- [ ] Microsoft Edge (Classic)
- [X] Microsoft Edge Chromium

Originally open for DNN Platform.
https://github.com/dnnsoftware/Dnn.Platform/issues/4496

通过 ViewSource.OnPackageClick 重现 Module Creator 流程，使用报告中的 C# User-Control 包步骤，并检查 Admin Logs 以获取 null 引用的详细信息。当创建包操作完成并生成安装包，而不是显示严重错误消息时，即表示完成。

由索引模型根据 Issue 内容生成。